| 利用随机数序列加密视频变长码字的新方法 |
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| 引用本文： | 杨志云,陈琳,李伟,徐正全.利用随机数序列加密视频变长码字的新方法[J].华中科技大学学报(自然科学版),2007,35(3):8-11. |
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| 作者姓名： | 杨志云 陈琳 李伟 徐正全 |
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| 作者单位： | 1. 武汉大学,测绘遥感信息工程国家重点实验室,湖北,武汉,430079
2. 长江大学,计算机科学学院,湖北,荆州,434023 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)
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湖北省科技攻关项目
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湖北省武汉市科技攻关项目 |
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| 摘 要： | 提出了一种随机改变熵编码码表来实现视频变长码字加密的方法.将熵编码码表中的码字按长度等特征分组,对视频内容信息事件序列做熵编码时,对应每一事件产生一个随机数确定其编码成同组内的哪一码字,随机数序列由二进制随机序列生成以保证随机性.该方法解决了密文出现非法变长码字的难题,保证密文格式兼容,不降低压缩率,达到序列密码的抗攻击强度且计算速度快10倍以上.实验证明密文画面不能理解,该算法适用于MPEG,H.26x及JPEG等主流编码信号.
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| 关 键 词： | 视频加密 变长码字 改变变长码表 随机序列 利用 随机数序列 序列加密 频变 码字 方法 sequences random number coding length variable video method 编码信号 JPEG MPEG 算法 验证 计算速度 攻击强度 |
| 文章编号： | 1671-4512（2007）03-0008-04 |
| 修稿时间： | 2006-01-06 |
A novel method to encrypt video variable length coding codeword by random number sequences |
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| Yang Zhiyun,Chen Lin,Li Wei,Xu Zhengquan.A novel method to encrypt video variable length coding codeword by random number sequences[J].JOURNAL OF HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY.NATURE SCIENCE,2007,35(3):8-11. |
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| Authors: | Yang Zhiyun Chen Lin Li Wei Xu Zhengquan |
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| Institution: | 1.State Key Laboratory for Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, China; 2.College of Computer Science, Yangtze University, Jingzhou 434023, Hubei China |
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| Abstract: | Video variable length eodewords were encrypted by randomly changed variable length coding table while each codeword was coded. The codewords were grouped into the table according to their length. While coding the video event stream, a random number corresponding to every event was generated to decide which codeword in its group the event should be coded to. The randomness of the number sequence was ensured by generated from binary system random sequence. The difficult problem of generating forbidden codewords was solved while enciphering video in the algorithm. It can completely keep video coding format compliance and compression ratio. It has the same anti-attack strength as direct stream cipher method while its speed is over ten times faster than the latter to meet real-time requirement. The experiments show that the cipher pictures are fully disguised. The method can be applied to MPEG, H. 26x, and JPEG signal, and can be made as a separate modular. |
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| Keywords: | video encryption variable length codeword changed coding table random sequence |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
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